On my company's Mirtec systems, we create the thru hole components without creating any MMD data, since we don't have any CAD data to base it off of. We don't have any need for any of the gerber files, either. We simply draw the component and its features over a board that's been built. After doing that, highlight all of the windows and right click-> group part, and at the top right of the program, you can change the name of the component and the name of the reference ID to whatever you'd like. I hope this helps.